1991

0.0

1993

6.6

2001

0.0

2009

6.3

2007

5.3

2010

0.0

1997

6.5

1994

6.2

1994

9.0

2000

6.1

2008

7.6

1980

3.7

2007

6.6

2017

6.3

1982

6.3